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| Home > Publications database > Tomographic observations of gravity waves with the infrared limb imager GLORIA |
| Book/Dissertation / PhD Thesis | FZJ-2018-06854 |
2020
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
Jülich
ISBN: 978-3-95806-481-2
Abstract: Gravity waves drive global circulations in the mesosphere and stratosphere. Due to their small scales, they are usually not resolved in current global circulation models. Thus, their impact on the circulation is implemented in the form of simplified sub-models called parameterisation schemes. Several theoretical studies have high lighted that the assumptions on which these parameterisation schemes are based need to be reconsidered. However, the confirmation of these studies through measurements is still missing. A novel airborne remote sensing instrument, which can provide exactly such measurements, is the Gimballed Limb Observer for Radiance Imaging of the Atmosphere (GLORIA). GLORIA has two different measurement modes suitable for gravity waves: full angle tomography and limited angle tomography. Full angle tomography allows for the reconstruction of the atmospheric temperature structure with a spatial resolution of 20km in both horizontal directions and 200m in the vertical at an accuracy of 0.5 K. This spatial resolution is very high for remote sensing instruments. Three-dimensional volumes reconstructed with limited angle tomography have a resolution of 30km in flight direction, 70km across flight track, and 400m in the vertical at an accuracy of 0.7 K. Full angle tomography is better suitable for small-scale gravity waves with unknown orientation and limited angle tomography for non-stationary waves. ...
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